The number of foreclosures in South Florida jumped by more than 100 percent in April, according to data from foreclosure tracking firm RealtyTrac, due to continuing unemployment, loan problems and falling property values. Foreclosure filings rose 111 percent in Miami-Dade County between March and April and were up nearly 90 percent year-over-year. Broward County foreclosures spiked 124 percent month-to-month and 91 percent year-over-year. Miami-Dade and Broward counties ranked third and fourth in the state, respectively, for the highest percentage increases in foreclosures. In Palm Beach County, foreclosures were up 89 percent from March and 44 percent from April 2008.